/* ***** BEGIN LICENSE BLOCK *****
 *   Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is ThumbsDown.
 *
 * The Initial Developer of the Original Code is
 * Atte Kemppilä.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * 
 * ***** END LICENSE BLOCK ***** */


const EXPORTED_SYMBOLS = ["ScriptManager"];

const Cu = Components.utils;

Cu.import("resource://gre/modules/Services.jsm");

Cu.import("resource://thumbsdown/ThumbsDown.jsm");


const ScriptManager =
{
    __scripts: null,
    
    get _scripts()
    {
        if (this.__scripts == null)
        {
            // copy the script array and sort scripts according usage counter (approx. lru)
            ThumbsDown.ScriptStore.open();
            this.__scripts = ThumbsDown.ScriptStore.getScripts();
            this.__scripts = this.__scripts.slice();
            this.__scripts.sort(function(a, b) { return b.counter - a.counter; });
        }
        
        return this.__scripts;
    },
    
    reset: function()
    {
        this.__scripts = null;
    },
    
    lookup: function(thumbnail)
    {
        return this._lookup(thumbnail, true);
    },
    
    lookupAll: function(thumbnail)
    {
        return this._lookup(thumbnail, false);
    },
    
    _lookup: function(thumbnail, firstOnly)
    {
        let scripts = this._scripts;
        let matches = [];
        
        for (let index = 0; index < scripts.length; index++)
        {
            let script = scripts[index];
            
            if (script.match(thumbnail))
            {
                // re-order scripts (lru)
                if (index > 0)
                    scripts.splice(0, 0, scripts.splice(index, 1)[0]);
                
                if (firstOnly)
                    return script;
                
                matches.push(script);
            }
        }
        
        return (firstOnly ? null : matches);
    },
}


// reset ScriptManager whenever ScriptStore changes
Services.obs.addObserver({observe: function() { ScriptManager.reset(); } }, ThumbsDown.ScriptStore.TOPIC, false);
